canvas{
    background-color:lightyellow;
    color:darkgreen;
    border:1px solid black;
}
div.canvas{
    margin-left: auto;
    margin-right: auto;
    margin-top: 30px;
    height: 800px;
    width: 1100px;
    overflow: auto;
    border:1px solid black;
}
.block{
    font-size: smaller;
    line-height: 20px;
    text-align: center;
}
table#interface{
    width: 1000px;
    margin:0 auto;
    background-color: lightyellow;
    border: gray 1px solid;
    border-collapse: collapse;
}
table td{
    border: gray 1px solid;
    width: 20%;
}